Hanger shell puller



Dec. 15, 1953 M. R. sHEAFFER HANGERSHELL FULLER Filed March 25, 19.50

vINVENTOR. /wf/ @msm/fer BY Patented ec. l5, 1953 UNITED STATES BATEN OFFICE 1 Claim.

The present invention relates to devices for pulling hanger shells and is concerned primarily with a device which includes both mechanism for interlocking within the shell and impact means which may be employed to rock the shell loose.

rihe invention has in view as its foremost objective the provision of a hanger shell puller which includes as its essential and characteristic element an elongated tubular member on which is operatively mounted all of the devices which enter into the pulling of the hanger shell.

More in detail, the invention has as an object the provision of a hanger shell puller comprising an elongated tubular member on which is operatively mounted a hammer and which carries at one end latch arms which are designed to interlock with a hanger shell, together with a latch rod for holding the latch arms in a collapsed or released position.

In accordance with the present invention, the impact member or hammer takes the form of a heavy weight which is mounted for reciprocation between certain limits on the tubular member. important features of the invention are associated with the manner in which this 'weight is mounted and guided in its movements.

Another object of the invention is to provide, in a hanger shell puller including an elongated tubular member as its characteristic element, mechanism for interlocking within a hanger shell, and which mechanism takes the form of a pair of complemental latch arms which are springebiased so that when they are released they will project through slots in the tubular member and engage a shell to interlock therewith. important features are tied up with the mounting of these latch arms in the tubular member.

Under certain conditions it is desirable, if not necessary, to maintain the'latch arms in a retracted or collapsed condition. To this end, a latch rod is mounted for reciprocal movement in the tubular member and one end is disposed adjacent to the latch arms. This end is formed with a depression or recess which is adapted to receive the ends of the latch arms to maintain them in a retracted position.

Various other more detailed objects and advantages of the invention, such as arise in connection with carrying out the above noted ideas in a practical embodiment, will in part become apparent and in part be hereinafter stated as the description of the invention proceeds.

The invention therefore comprises a hanger 'trated and includes a bore il.

shell puller consisting essentially of an elongated tubular member. A hammer is mounted for reciprocation between fixed limits on this tubular member and one end carries a pair of vlatch arms which are adapted to interlock with a hanger shell. A latch rod is mounted within the tubular member and is adapted to hold the latch arms in a retracted position or be moved to release the latch arms.

For a full and more complete understanding of the invention, reference may be had to the following description and accompanying drawing, wherein: l

Figure l is a longitudinal section through a hanger shell puller, designed in accordance with the precepts of this invention;

Figure 2 is a View, mostly in elevation but partially in section, of the hanger shell puller;

Figure 3 is an enlarged detailed showing of one end of the tubular member depicting one of the slots therein through which a latch arm projects; and

Figure 4 is a detailed perspective of one of the latch arms.

Referring now to the drawing wherein like characters of reference indicate corresponding parts and, rst, more particularly to Figures l and 2, a hanger shell puller is therein depicted as including, as an essential and characteristic element, a tubular member il). This tubular member le is of the elongated formation illus- Over a zone ad jacent to one end of the tubular member it, the latter is formed with a pair of diametrically opposed slots I2.

An impact member in the form of a cylindri cally shaped hammer i3 is mounted for reciprocation on the tube it over the zone in which the slots i2 are formed. The latter are intended to function as keyways and the hammer i3 carries a key I-'l which passes through the keyways i2. Pins such as shown at i5 in Figure 2 may be employed to secure the key lll in position.

Just beyond the outer ends of the slots i2, the bore ll is threaded and this threaded bore receives a screw plug i6. Beyond the opposite or inner ends of the slots I2 the tubular member lil carries a cross pin il, which is intended to function as a stop for limiting movement of the hammer I3. It is evident that the hammer i3 may be reciprocated over the upper end portion of the tubular member l, as illustrated in Figures 1 and 2 and guided in its movements by the key I4 and keyways l2.

Adjacent to the end remote from that carry- 3 ing the plug I6, the tube I is formed with a pair of diametrically opposed slots |8. Carried by the tube I0, adjacent to the outer end of the slots I8 and disposed in a direction normal to the plane of the slots is a hinge pin I9. A pair.

of latch arms 29 and 2| are pivotally mounted on this hinge pin I9. An expansion coil spring 22 normally biases these arms to their spread position and will cause the free ends of the arms to project through the slots I8 when the latch arms are disposed thereopposite.

The latch arms and 2| are substantial duplicates and one of them is shown in detail in Figure 4. This is the arm designated 29, and it will be noted that it is carried by hub portion 23 having an opening 24 which receives the hinge pin i9. This hub portion 2-3 is shaped to properly conform to the bore of the tube l0. The outer free end of each of the latch arms 20 and 2| is formed with an inclined surface 25 which denes a pointed edge 26.

Beyond the pin I9, the bore is threaded and receives ascrew plug 21 which closes the bore at that end.

A latch rod is designated 28 and has one end disposed towards the latch arms 20 and 2|. This end of the latch rod 28 is formed with a recess or depression 29 which is adapted to receive the pointed end edges of the latch arms 28 and 2|. At its opposite end the latch rod 28 carries a cross pin 30 which extends through slots 3| formed in the tubular member I0. A collar 34 is slidably mounted on the tubular member I8 and receives the ends of the crosspin 30. Obviously, the collar 34 may be availed of Operation While the manner of using the hanger shell puller above described is believed to beV obvious from the description of the parts given, it may be briey outlined by noting that under normal. conditions the latch arms 20 and 2| will be retained in the retracted or collapsed position illustrated in Figure 1 by the latch rod 28.v In this position the tubular member I9 is inserted.

into the shell S and the latch rod operated. t0

release the latch arms 29 and 2|. The latter now move into the spread position illustrated in Figure 2, in which they projectv through the slots I8 with the surfaces 25 engaging the shoulders 33 of the shell S. The latch arms are moved 4 into this position under the influence of the spring 22.

If it is necessary to break loose the shell S, the hammer |3 may be reciprocated to give the desired impact effect. After the shell has been broken loose, it may be Withdrawn by exerting a proper pull on the tubular member I0.

In order to disengage the tubular member I0 from the shell S, the latch arms 20 and 2| are collapsed and the latch rod 28 moved so that the recess 29 receives the pointed end edges 2B to maintain the retracted position. In this position the tubular member I0 may be withdrawn from the shell S.

While a preferred specic embodiment ofthe invention is hereinbefore set forth, it is to be clearly understood that the invention is not to be limited to the exact mechanisms, constructions and devices illustrated and described because various modications of these details may be provided in putting the invention into practice within the purview of the appended claim.

What is claimed is:

In a hanger shell puller of the character described, an elongated tubular member having a bore and formed with a pair of keyways adjacent one end thereof, a hammer mounted for reciprocation on said tubular member and having a key received in said keyways, a stop for said hammer carried by said tubular member approximately midway thereof, said tubular member being formed with a pair of diametrically opposed slots at the end remote from said keyways, a hinge pin carried by said tubular member adjacent to the outer end o1" said slots, a pair of complemental latch arms pivotally mounted on said pin and having free ends adapted to project through said slots to engage a hanger shell, spring means biasing said latch arms into the spread position in which the ends thereof project through said slots. said tubular member being formed with a slot between said stop and said pair of slots, a latch rod mounted for reciprocation within said tubular member and carrying a projection extending through said slot, and means on one end of said latch rod for engaging said latch arms to maintain them in a retracted position.

MIRL RALPH SHEAFFER.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,487,592 Novotny Mar. 18, 1924 1,814,058 Powers l July 14, 1931 1,893,414 Johnson et al. Jan. 3, 1933 2,098,134 Cook et al. s Nov. 2, 1937 2,261,393 Kothny NOV. 4, 1941 2,454,839 Ring NOV. 30, 1948 2,481,637 Yancey Sept. 13, 1949 

